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检索条件"主题词=Algorithm development"

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FREQUENCY-CHANNEL-BASED VISUAL MODELS AS QUANTITATIVE QUALITY MEASURES IN HALF-TONING 4

FREQUENCY-CHANNEL-BASED VISUAL MODELS AS QUANTITATIVE QUALIT...

引用

CONF ON HUMAN VISION, VISUAL PROCESSING, AND DIGITAL DISPLAY 4

作者： MITSA, T VARKUR, KL ALFORD, JR Univ. of Iowa (United States)

ISBN: (纸本)0819411469

The recent proliferation of digital binary output devices, such as laser printers and facsimile machines, has brought increased attention to high quality halftone reproduction. A question that often arises in halftone research is how to evaluate the quality of halftone images using a quantitative quality metric. Such metrics would allow objective evaluation, could be incorporated in halftoning algorithms, in addition to being independently reproducible. Given that halftoning introduces unique types of distortions and the display medium (a hardcopy device) is different than that of conventional image processing applications (a CRT display), it becomes necessary to develop visual models specifically for halftoning applications. In this paper, frequency-domain visual models are investigated as to their suitability for the formulation of quantitative quality metrics specifically for halftoning applications. Two types of frequency-domain models are investigated: models that utilize a simple contrast-sensitivity function and models that utilize multiple independent narrowband channels. The quantitative quality metric for both types of models is formulated as a weighted frequency domain error. Since the ultimate judges of image quality are human viewers, the success of the quantitative measures is assessed by comparing their results with the results of a psychovisual test performed on halftone images.

关键词： Visual process modeling Halftones Visualization Visual system Image quality Contrast sensitivity Eye models Image filtering algorithm development Spatial frequencies

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BAYESIAN FIELD TRACKING

BAYESIAN FIELD TRACKING

引用

5TH CONF ON SIGNAL AND DATA PROCESSING OF SMALL TARGETS

作者： LINDGREN, R TAYLOR, L Arete Associates (United States)

ISBN: (纸本)0819411906

In this paper we address the problem of tracking a signal through successive intervals of matched-filter processing. The common approach to this problem is to locate candidate detections in the matched-filter output at each interval, to associate successive detections in state space, to estimate successive states through a Kalman filter application, and to rank association sequences (tracks) with respect to kinematic consistency. However, if a signature model is available and matched-filter statistics are known, the matched-filter output can be converted to a likelihood function that can drive recursive Bayesian processing for the signal state distribution (and no-signal probability). The field tracker described here follows this processing, compromising the optimality of the Bayesian approach only through the discreteness of the state-space domain. The field approach has a detection capability superior to that of an association approach for low SNR signals, and it is highly compatible with parallel processing. An application to the detection and tracking of a constant-velocity signal in 4-D state space (2-D position, 2-D velocity) is provided by way of illustration, and it demonstrates the ability to achieve a conclusive detection of a 3.5-dB-per-update target in ten updates. A number of application alternatives are described that extend the concept to multiple-target scenarios, refined velocity estimates, connection to velocity-independent processing steams, and computationally efficient means of estimating kinematic variables and signal amplitude through auxiliary fields.

关键词： Signal processing Signal to noise ratio Detection and tracking algorithms Kinematics algorithm development Logic Filtering (signal processing) Interference (communication) Electronic filtering Parallel processing

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COMPRESSION OF UOSAT-5 EIS IMAGES 3

COMPRESSION OF UOSAT-5 EIS IMAGES

引用

3RD CONF ON SMALL-SATELLITE TECHNOLOGY AND APPLICATIONS

作者： MONTPETIT, MJ PRIEUR, L FOUQUET, M Spar Aerospace Ltd. (Canada) Univ. of Surrey (United Kingdom)

ISBN: (纸本)0819411760

As part of its small satellite R&D activities, Spar Aerospace Limited is studying the applicability of onboard real-time data compression to solve some problems of data storage onboard small satellites and of data delivery to remote users. To fulfill this goal, a collaboration was established with the University of Surrey Spacecraft Engineering Unit to test Spar's compression code on UoSAT-5 EIS images and have it ultimately executed onboard UoSAT-5. Image compression of the UoSAT-5 remote sensing data has been achieved by a number of algorithms including lossy methods such as the `discrete cosine transform' (DCT) related to the JPEG standard, the `block truncation' (BT), the `vector quantization (VQ) as well as lossless compression methods.

关键词： Image compression Image processing Data storage Satellites Remote sensing algorithm development Space operations Data compression Image quality Satellite imaging

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CONSTANT-TIME CONVEX POLYGON algorithmS ON RECONFIGURABLE MESHES

CONSTANT-TIME CONVEX POLYGON ALGORITHMS ON RECONFIGURABLE ME...

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CONF ON VISION GEOMETRY

作者： OLARIU, S SCHWING, JL ZHANG, J Old Dominion Univ. (United States) Elizabeth City State Univ. (United States)

ISBN: (纸本)0819410330

In an attempt to overcome the inefficiency of handling data transfer operations over long distances, mesh-connected computers have recently been augmented by the addition of various types of bus systems. One of the most efficient such augmented computer systems is referred to as the reconfigurable mesh, that is, a mesh-connected computer overlaid with a reconfigurable bus system. In this paper we propose constant-time algorithms on reconfigurable meshes for a number of important computational geometry tasks relevant to computer vision. These include testing an arbitrary polygon for convexity, computing the union and intersection of two convex polygons, testing whether two convex polygons are separable and, if so, constructing a separating line, solving the polygon containment problem for convex polygons, and others. Our solutions rely on a recently developed VLSI-optimal sorting algorithm for reconfigurable meshes and on a number of novel data movement techniques. The proposed algorithms translate immediately into constant-time algorithms that work on binary images.

关键词： Computing systems Image processing Vision geometry Machine vision Very large scale integration Computer vision technology algorithm development Binary data Lithium Computer architecture

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GLOBAL IMAGE MATCHING AND SURFACE RECONSTRUCTION IN OBJECT SPACE USING AERIAL IMAGES

GLOBAL IMAGE MATCHING AND SURFACE RECONSTRUCTION IN OBJECT S...

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CONF ON INTEGRATING PHOTOGRAMMETRIC TECHNIQUES WITH SCENE ANALYSIS AND MACHINE VISION

作者： EBNER, H HEIPKE, C HOLM, M Technical Univ./Munich (Germany) Technical Research Ctr. of Finland (Finland)

ISBN: (纸本)0819411809

A general model for digital photogrammetry has been developed, integrating area-based multi- image matching, point determination, object surface reconstruction and orthoimage generation. Using this model the unknown quantities are estimated directly from the pixel intensity values and from control information in a nonlinear least squares adjustment. The unknown quantities are the geometric and radiometric parameters for the description of the object surface (e.g. the heights of a digital terrain model and the intensity values of all points on the surface), and the orientation parameters of the images. Any desired number of images, scanned in various spectral bands, can be processed simultaneously. The convergence radius or pull-in range, known to be rather poor (a few pixels only) in least squares matching, is considerably extended, and the computation time is considerably reduced by using a hierarchical procedure with image pyramids. Some tests using this approach on real aerial imagery were made. They constitute the first controlled tests of the approach and prove its applicability for practical needs.

关键词： Digital imaging Image processing Digital image processing Photogrammetry algorithm development Chemical elements Photography Digital photography Image filtering Remote sensing

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REGISTRATION OF A 3D SENSOR AND A 2D SENSOR MEASURING RANGE AND AZIMUTH

REGISTRATION OF A 3D SENSOR AND A 2D SENSOR MEASURING RANGE ...

引用

5TH CONF ON SIGNAL AND DATA PROCESSING OF SMALL TARGETS

作者： HELMICK, RE RICE, TR Naval Surface Warfare Ctr. (United States)

ISBN: (纸本)0819411906

An algorithm is presented to relatively align a 3D sensor and a 2D sensor measuring range and azimuth. The alignment is done using common targets that are tracked by both sensors. The algorithm estimates and removes sensor biases and sensor frame orientation errors. For illustrative purposes, the alignment algorithm is applies to simulated track data.

关键词： Sensors 3D metrology 3D acquisition Detection and tracking algorithms Filtering (signal processing) Silicon algorithm development Computer simulations Spherical lenses Image registration

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POLYGONAL-APPROXIMATION FOR THE ACQUIRED CONTOUR BY USING SPLINE

POLYGONAL-APPROXIMATION FOR THE ACQUIRED CONTOUR BY USING SP...

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CONF ON VISION GEOMETRY

作者： LEE, K Arizona State Univ. (United States)

In this paper, data reduction for the acquired contour is discussed. Lyche's knot-removal algorithm is introduced. For the given sets of points on the contour, we reduce the number of data points without distortin... 详细信息

ISBN: (纸本)0819410330

关键词： Tolerancing algorithm development Data acquisition OSLO Binary data Vision geometry Data processing Computer science Condition numbers Mining

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EFFICIENT EIGENVALUE COMPUTATION ON THE MASPAR 4

EFFICIENT EIGENVALUE COMPUTATION ON THE MASPAR

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4TH CONF ON ADVANCED SIGNAL PROCESSING algorithmS, ARCHITECTURES, AND IMPLEMENTATIONS

作者： HUO, Y SCHREIBER, R Princeton Univ. (United States) NASA Ames Research Ctr. (United States)

ISBN: (纸本)0819412767

Many applications of the eigenvalue decomposition of dense matrices are well known. This work was prompted by research in the numerical simulation of disordered electronic systems, in which one of the most common approaches is to diagonalize random Hamiltonian matrices in order to study the eigenvalues and eigenfunctions of a single electron in the presence of a random potential. In this paper, we describe an effort to implement a matrix diagonalization routine for real symmetric dense matrices on massively parallel SIMD computers, the Maspar MP-1 and MP-2 systems. Results of numerical tests and timings are also presented.

关键词： Matrices algorithm development Computer programming Computing systems Evolutionary algorithms Numerical simulations Electrical engineering Linear algebra Parallel computing Computer science

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INTERFEROMETRIC TESTING OF ANNULAR APERTURES

INTERFEROMETRIC TESTING OF ANNULAR APERTURES

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CONF ON SPECIFICATION AND MEASUREMENT OF OPTICAL SYSTEMS

作者： MELOZZI, M PEZZATI, L Officine Galileo SpA (Italy)

ISBN: (纸本)081940960X

Zernike circle polynomials generally employed in interferometric mastermind fitting software fail on an annular dominion. Therefore, when testing catadioptric optics erroneous results may be obtained. We performed interferometric measurements on annular pupils at increasing obscuration ratios, and we fitted the resulting aberration wave-fronts using either Zernike circle polynomials and another polynomial set orthogonal over an annulus. The results obtained with the two different sets are compared and the limits of the standard interferometric fitting software are pointed out.

关键词： Interferometry Monochromatic aberrations Optical testing Objectives Spherical lenses Standards development algorithm development Combined lens-mirror systems Wavefronts Stars

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HIERARCHICAL VECTOR REPRESENTATION OF DOCUMENT IMAGES

HIERARCHICAL VECTOR REPRESENTATION OF DOCUMENT IMAGES

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Conference on Video Communications and PACS for Medical Applications

作者： ABLAMEYKO, S BEREISHIK, V PARAMONOVA, N MARCELLI, A ISHIKAWA, S BELARUSIAN ACAD SCI INST ENGN CYBERNET 220012 MINSK BELARUS

ISBN: (纸本)0819412236

A hierarchical data structure for the representation of document images in vector form is suggested, which allows to store in compact form all needed information about connected components, segments and feature points. The process steps for obtaining this data structure are described. A fast one-pass algorithm for the transformation of a large-size thinned image into the vector form is suggested. The defects which can exist in the vector representation are extracted and an algorithm for their reduction is shortly described. Experimental results are also shown.

关键词： Image segmentation Image processing algorithms and systems Inspection Data storage Detection and tracking algorithms Object recognition algorithm development Image processing Raster graphics 3D modeling

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